I assume that you're using Yget as your template. If not tell what template you're using.
If you're using Yget open your main.css file and ffind this block:
Code:
#nav-secondary a {
line-height:1.5;
font:96% arial;
display:block;
color:#66c;
border-bottom:1px solid #eadfb4;
}
And change the color to what you want.